More compact search page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/stylesheets/pages/search.scss

 .search-results {
   .search-result-row {
-    border-bottom: 1px solid #EEE;
-    padding-bottom: 10px;
-    margin-bottom: 10px;
+    border-bottom: 1px solid #DDD;
+    padding-bottom: 15px;
+    margin-bottom: 15px;
   }
 }

app/views/search/_category.html.haml

-%ul.nav.nav-pills.search-filter
+%ul.nav.nav-tabs.search-filter
   - if @project
     %li{class: ("active" if @scope == 'blobs')}
       = link_to search_filter_path(scope: 'blobs') do

app/views/search/show.html.haml

 - page_title @search_term
 = render 'search/form'
-%hr
+%br
 - if @search_term
   = render 'search/category'
-  %hr
   = render 'search/results'